linux-kernel - Re: [PATCH v3 6/8] RISC-V: KVM: Add ONE

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Date:   Tue, 4 Apr 2023 06:25:24 +0530
From:   Atish Patra <atishp@...shpatra.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <anup@...infault.org>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/8] RISC-V: KVM: Add ONE_REG interface for AIA CSRs

On Mon, Apr 3, 2023 at 3:03 PM Anup Patel <apatel@...tanamicro.com> wrote:
>
> We implement ONE_REG interface for AIA CSRs as a separate subtype
> under the CSR ONE_REG interface.
>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> ---
>  arch/riscv/include/uapi/asm/kvm.h | 8 ++++++++
>  arch/riscv/kvm/vcpu.c             | 8 ++++++++
>  2 files changed, 16 insertions(+)
>
> diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
> index 182023dc9a51..cbc3e74fa670 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -79,6 +79,10 @@ struct kvm_riscv_csr {
>         unsigned long scounteren;
>  };
>
> +/* AIA CSR registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
> +struct kvm_riscv_aia_csr {
> +};
> +
>  /* TIMER registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
>  struct kvm_riscv_timer {
>         __u64 frequency;
> @@ -107,6 +111,7 @@ enum KVM_RISCV_ISA_EXT_ID {
>         KVM_RISCV_ISA_EXT_ZIHINTPAUSE,
>         KVM_RISCV_ISA_EXT_ZICBOM,
>         KVM_RISCV_ISA_EXT_ZBB,
> +       KVM_RISCV_ISA_EXT_SSAIA,
>         KVM_RISCV_ISA_EXT_MAX,
>  };
>
> @@ -153,8 +158,11 @@ enum KVM_RISCV_SBI_EXT_ID {
>  /* Control and status registers are mapped as type 3 */
>  #define KVM_REG_RISCV_CSR              (0x03 << KVM_REG_RISCV_TYPE_SHIFT)
>  #define KVM_REG_RISCV_CSR_GENERAL      (0x0 << KVM_REG_RISCV_SUBTYPE_SHIFT)
> +#define KVM_REG_RISCV_CSR_AIA          (0x1 << KVM_REG_RISCV_SUBTYPE_SHIFT)
>  #define KVM_REG_RISCV_CSR_REG(name)    \
>                 (offsetof(struct kvm_riscv_csr, name) / sizeof(unsigned long))
> +#define KVM_REG_RISCV_CSR_AIA_REG(name)        \
> +       (offsetof(struct kvm_riscv_aia_csr, name) / sizeof(unsigned long))
>
>  /* Timer registers are mapped as type 4 */
>  #define KVM_REG_RISCV_TIMER            (0x04 << KVM_REG_RISCV_TYPE_SHIFT)
> diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
> index aca6b4fb7519..15507cd3a595 100644
> --- a/arch/riscv/kvm/vcpu.c
> +++ b/arch/riscv/kvm/vcpu.c
> @@ -58,6 +58,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
>         [KVM_RISCV_ISA_EXT_I] = RISCV_ISA_EXT_i,
>         [KVM_RISCV_ISA_EXT_M] = RISCV_ISA_EXT_m,
>
> +       KVM_ISA_EXT_ARR(SSAIA),
>         KVM_ISA_EXT_ARR(SSTC),
>         KVM_ISA_EXT_ARR(SVINVAL),
>         KVM_ISA_EXT_ARR(SVPBMT),
> @@ -97,6 +98,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
>         case KVM_RISCV_ISA_EXT_C:
>         case KVM_RISCV_ISA_EXT_I:
>         case KVM_RISCV_ISA_EXT_M:
> +       case KVM_RISCV_ISA_EXT_SSAIA:
>         case KVM_RISCV_ISA_EXT_SSTC:
>         case KVM_RISCV_ISA_EXT_SVINVAL:
>         case KVM_RISCV_ISA_EXT_ZIHINTPAUSE:
> @@ -520,6 +522,9 @@ static int kvm_riscv_vcpu_get_reg_csr(struct kvm_vcpu *vcpu,
>         case KVM_REG_RISCV_CSR_GENERAL:
>                 rc = kvm_riscv_vcpu_general_get_csr(vcpu, reg_num, &reg_val);
>                 break;
> +       case KVM_REG_RISCV_CSR_AIA:
> +               rc = kvm_riscv_vcpu_aia_get_csr(vcpu, reg_num, &reg_val);
> +               break;
>         default:
>                 rc = -EINVAL;
>                 break;
> @@ -556,6 +561,9 @@ static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
>         case KVM_REG_RISCV_CSR_GENERAL:
>                 rc = kvm_riscv_vcpu_general_set_csr(vcpu, reg_num, reg_val);
>                 break;
> +       case KVM_REG_RISCV_CSR_AIA:
> +               rc = kvm_riscv_vcpu_aia_set_csr(vcpu, reg_num, reg_val);
> +               break;
>         default:
>                 rc = -EINVAL;
>                 break;
> --
> 2.34.1
>


Reviewed-by: Atish Patra <atishp@...osinc.com>
-- 
Regards,
Atish